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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9e290f5ae2afa6abac6dca2e0d62e7e129f852f2041da7829bff66f48667961' 
  AND token = 'XZcqR15GJfsP4BBHUUR3lYEcnLpuqYuK9ohkCpqN1rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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