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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c02db62f826dd56069c51d6736b8b2ec3497cb5ec56437cad1a51edaa0296027' 
  AND token = '4Az5tL8oUSq8E07NUqSnBJJB7t4OuoQxRigccdRN6+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}