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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bc8a09a537e87aeb893dbb0e3cd4ab501f018a50759029df6ac800e6c903993' 
  AND token = 'RC1YfqzXd6npvb7+wYIIAthd5cRs6gQwMeg9bBU+kls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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