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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b79333101ccd2daee1efdc885ee0aee8835374644ff2f3cb89a82ee2b428ee20' 
  AND token = 'LfEcP+n0FZa/00RK8Ec6IVjrXr6TkyadSaePWE2wNnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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