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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb3a3a9c5eed0b2e86944a2bab973e3c6c18994a999766185b1483fe1afd70bf' 
  AND token = '3Haz4im6wCswbwSEYSMlCLCDYiqwwtcQOKOW8neHAoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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