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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96f62abe067590ae53f91c7f7a965589949022490facb7322067ee3e3305846a' 
  AND token = 'i45mdTxSObYpkK80OQ8U0sXAH4p/C4Ir+DFWOfYk8Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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