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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf632f4ae80b56483edeeecdf0045ac344eb48ee5086ede07f8045e590097b83' 
  AND token = '1eufojUTnsdg69mYWuu9/pzQEn1ZsCpRP/O2Z1y+mL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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