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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '031aa38d1d1923e9c44354514a86fb1d090a51c567652654f7ce3e094d86dd49' 
  AND token = 'MFI4TDcrDZmvh5SS7YpIu1E9Ar4Ot6sQL33x9bpqFDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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