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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdf5ce88eb714a9d20edd918eb2432cd5668de7e643fdc503e939f37bc568923' 
  AND token = 'exEg71yT++feTaS6NMwli6Y+BS8Yhc1F8l1VwVakGQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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