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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11a628eacc354e57cc1cc52e88c6e12f03019a4624b55d6eea3f2c4424bf9e4e' 
  AND token = 'dTlwdsJA+gKBe7v3Kk1ZEHDz286waHWr70/C4roS+Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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