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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc8ff432a450baca25be5b5a12b1bc570d35bdc32a6a4246592ffe0ccf1dc735' 
  AND token = 't3NCT2AfTLj2cBWYRv8w04bhobFPLRJDxpqgDpiwNJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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