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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39743ae9b7b8d48d13561b12cce653ae59800bdb706d27caf8c42617daaee2fb' 
  AND token = 'Cmvy1TrL6aUDFFsQ7lm1pT6s/aI8H2lB1UI8s3Uk9D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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