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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5ab75251b3d87b61759a81d02d853f62b182e76deb346252b00d98e6193b8b0' 
  AND token = 'jMN0L+nSKXLbfxh0XTuwW+1FSKi4DB1hHRDS05f8qFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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